Former three division world champion "Sugar" Shane Mosley is a mutual opponent for Floyd Mayweather Jr. (44-0, 26KOs) and Saul "Canelo" Alvarez (42-0-1, 30KOs). Mosley lost to both by twelve round decision. On September 14th at the MGM Grand in Las Vegas, Mayweather will once again move up in weight to challenge Canelo for his WBC/WBA junior middleweight titles at a catch-weight of 152-pounds.

Mosley says the much younger, less experienced Canelo has all of the necessary tools to defeat Mayweather.
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I think Shane just basically means he has the potential to beat him, and to be fair he does, weather he can on fight night we don't know, eveeryone goes in with the potential to be floyd, but somehow floyd is able to read the fight better.